Born ‎8- Feb 1907 Rotterdam, Netherland, died ‎14-5-1967 Utrecht, Netherland‎, 59 or 60 years. Occupation: Jurist. Daughter of Carel van Zwanenburg - Lion and Rosetta Rebecca Beer - Scheffer‏

Born ‎26-2-1911 Rotterdam, Netherland, died ‎17-4-2001 Emmen-Drenthe, Netherland‎, 89 or 90 years, ‎1st marriage/ related to: Adaele Zwanenburg - Beer, ‎2nd marriage to: Elvira Portier. Son of Louis de Leeuwe - van Stedum and Judith Velt - Viool‏